To foster the implementation of Mexico’s adaptation component of its Nationally Determined Contributions (NDC) under the Paris Agreement, both its nationwide payment for ecosystem services (PES) program and its National Strategy for Reducing Emissions from Deforestation and Forest Degradation (ENAREDD+) are regarded by the Ministry of Environment as solutions to improve the economic feasibility of adaptation measures. Mexico is reallocating its public expenditure to attend country-wide social needs causing budgetary constraints, which hinders PES and ENAREDD+ as funding sources. This led the National Institute of Ecology and Climate Change (INECC) to consider a PES with a matching funds approach to provide sufficient financial resources for adaptation measures. To estimate the available funds, INECC developed an exercise of economic valuation of ecosystem services. The watershed of Puerto Vallarta in Jalisco, Mexico, was the chosen location given its ecological and touristic importance and because of its urgent need to implement adaptation measures due to its heighted vulnerability to climate change. This article intends to showcase the value that upstream ecosystem services provide to tourism, the potential to implement adaptation measures in the region and to estimate local available funds to develop ecosystem-based adaptation measures (EbA). A literature review was conducted to understand the regional environmental, social, and economic dynamics and to identify the main ecosystem services; then, the value of ecosystem services was estimated via the willingness to pay and accept (WTP and WTA) using contingent valuation. Also economic data regarding forestry and agriculture was collected to calculate the forest conservation opportunity cost. The results showed that tourist and residents would be willing to pay circa $150 million USD per year and farmers would be willing to accept circa $75 million USD. This evidences the potential to implement forest conservation activities that will contribute to adaptation and mitigation objectives of Mexico’s NDC.

为了促进实施《巴黎协定》下墨西哥的国家自主贡献（NDC）适应性组成部分，该国考虑了其在全国范围内的生态系统服务付款计划（PES）和《减少森林砍伐和森林退化造成的国家战略》（ENAREDD +）。以环境部为解决方案，以提高适应性措施的经济可行性。墨西哥正在重新分配其公共支出，以满足全国范围内的社会需求，从而导致预算紧张，这阻碍了PES和ENAREDD +作为资金来源。这导致美国国家生态与气候变化研究所（INECC）考虑采用配套资金的方式来进行生态系统服务，以为适应措施提供足够的财政资源。要估算可用资金，INECC开展了对生态系统服务进行经济评估的活动。墨西哥哈利斯科州瓦拉塔港的分水岭，由于其生态和旅游重要性，并且由于其对气候变化的高度脆弱性而迫切需要执行适应措施，因此被选为地点。本文旨在展示上游生态系统服务为旅游业提供的价值，在该地区实施适应措施的潜力以及估算当地可用资金以开发基于生态系统的适应措施（EbA）。进行了文献综述，以了解区域环境，社会和经济动态并确定主要的生态系统服务；然后，通过使用或有估值的支付意愿和接受意愿（WTP和WTA）估算生态系统服务的价值。还收集了有关林业和农业的经济数据，以计算森林保护机会成本。结果表明，游客和居民每年愿意支付大约1.5亿美元，而农民愿意支付大约7500万美元。这证明了开展森林保护活动的潜力，这将有助于墨西哥NDC的适应和减缓目标。